Dump hoist



March 17, 1936. c. MARTELOCK DUMP HOIST Filed April 23, 1955 4Sheets-Sheet l 'An y MJ/ @ww n lwww\\W///\\\\Y////\\\\\www@Y6 S l s J? E IN V EN TOR. gf @54H55 Mnima/f 7 BY 5L- @www ATTORNEYS@ March 17, 1936. f;l MARTLCK 2,034,147

DUMP HOISW1 Filed April 25, 1935 4 SheeS-Sheet 2 arch 17, 1936. c. MARTELOCK DUMP HOIST 4 sheets-sheet s Filed April 25, 1935 March 17, 1936.

C. MARTELOCK 2,034,47

DUMP HOIST t Filed April 23, 1955 4 sheets-sheet 4 1N VEN TOR. @H4/@ES M41? TEL o Cfr BYMW,MWK1

ATTORNEYS.

Patented Mar. 17, 1936 UNITED STATES PATENT OFFICE Application April 23,

6 Claims.

My invention relates to improvements in dump hoists, and it consists of the combinations, constructions and arrangements hereinafter described and claimed.

An object of my invention is to provide a dump hoist which is primarily designed for mine shafts, and which can be operated by one man who is stationed within the mine. 'Ihe device makes use of a safety feature in which a holding lever prevents the dumping of the bucket until the bucket reaches the proper position. This holding lever does away with the necessity of providing a guide rail for the bucket where the bucket is of the counter-balanced type. A locking lever cooperates with the bucket-holding lever and prevents the accidental movement of the holding lever until the bucket reaches dumping position.

A further feature lies in the provision of a bucket carrier movable along the guide rails, this carrier being relatively long, and being movable into positions to extend a predetermined distance above the guide rails, or below the guide rails when the bucket is moved into its two extreme positions. This arrangement permits the guide rails to be shorter in length than would be otherwise necessary.

The device makes use of a swingable chute, and

further makes use of a roller designed to engage with the bucket during dumping movement. The counter-balance is also connected with the bucket carrier, and means is provided on the counterbalance for lengthening the cables connecting it with the bucket carrier. In this simple way the distance through which the bucket carrier moves can be changed at will.

A modified form of the invention is shown and illustrates the means for causing the counterbalance to move past the bucket carrier when the entire device is inclined from the vertical. 'Ihis form of the device is adapted for mine shafts extending at an angle into the earth.

Other objects and advantages will appear in the following specification, and the novel features of the device will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings forming a part of this application, in which Figure 1 is a vertical transverse section through the device, portions being shown in elevation;

Figure 2 is a rear elevation of Figure 1;

Figure 3 is a view similar to Figure 1, but showing the parts in a diiierent position;

1935, Serial No. 17,869

Figure 4 is also a view similar to Figure 1, but showing the bucket in dumping position;

Figure 5 is a rear elevation of the counterbalance;

Figure 6 is a section along the line 6-6 of Figure 5;

Figure '7 is a side elevation of a modified form of the invention shown adapted for inclined mine shafts;

Figure 8 is a rear elevation of a portion of Figure 7; and

Figure 9 is a section along the line 9-9 of Figure 8.

In carrying out my invention I provide a frame indicated generally at I. This frame carries two guide rails 2 .and 3, see Figure 2. These rails extend a considerable distance above the ground level 4, and also extend any predetermined distance into a mine shaft 5. Although the device is adapted for use in mines, it is obvious that it can be used for any other purpose for which dump buckets are adapted.

I provide a bucket carrier indicated generally at 6 and it will be noted that this carrier comprises two elongated shoes 1-1 disposed on each of the guides 2 and 3. Figure 1 shows how the shoes 1 1 slidably contact with opposite sides of the guide 2. The shoes are connected together by cross pieces 8, and the shoes on opposite guides are connected together by cross pieces 9. It will be seen from this that the bucket carrier 6 can freely slide along the guides 2 and 3, and the length of the shoes 1 is such as to permit the top portion of the carrier to be moved above the top of the guides 2 and 3 when the carrier is in its extreme uppermost position, and to permit the bottoms of the shoes I-'I to extend below the bottoms of the guides 2 and 3 when the carrier is in its extreme lowermost position. This permits the guide rails 2 and 3 to be made shorter than it would otherwise be necessary. Furthermore the guide rails 2 and 3 can terminate above the bottom of the mine shaft 5, and this will give more freedom to the operator for digging purposes.

The device is designed primarily for operation by one man, and the operator can actuate the device from a position within the mine shaft 5. To this end I provide a counterbalance weight indicated generally at I0, and this weight is connected to the bucket carrier 6 by cables I I and I2, see Figure 2. Another cable I3 is connected to= the weight III, and to the bottom of the bucket carrier 6.

The weight is shown in detail in Figures 5 and 6. Figure 5 shows the weight I9 as comprising a casing in which a spool I4 is rotatably mounted. The spool is secured to a shaft I5 and has the cables II and I2 wrapped therearound. Figure 5 shows the cables I I and I2 passed over idlers I5 and I1.

A hand crank I8 is pivoted to the shaft I5 at I9 and it may be swung from the full line position shown in Figure 6 to the dotted line position, and then rotated for either winding the cables I I and I2 onto the spool I4, or for unwinding the cables therefrom. In this simple way the effective length of the cables II and I2 is varied and the distance through which the bucket carrier 6 can move is also varied.

In order to lock the spool I4 against accidental rotation I provide a ratchet 20 which is rigidly secured to the shaft I5 and I also mount a pawl 2| on the casing I0, this pawl engaging with the ratchet to preventY the unwinding of the spool or reel I4. As a further means of locking the device I provide the casing IU with an opening 22 for receiving the end of the crank handle I8.

When the effective lengths of the cables I I and I2 are altered it is necessary to also alter the effective length of the cable I3. In Figures 5 and 6 I show the cable I3 as being secured tothe casing I0 at 23. The cable is then wrapped v around a support 24 through a number of turns as shown at 25 and then the free end of the cable is passed through a hook 26. If it is desired to shorten the overall length of the cable I3, it is merely necessary to wrap a few more turns of the cable around the support 24, and then to pass the free end through the hook 26. This will prevent the turns of the cable 25 from unwinding. On the other hand, if it is desired to lengthen the overall length of the cable I3, the portion of the cable passing through the hook 26 can be temporarily freed, and then a number of turns of the cab-le unwound from the support 24, whereupon the free end of the cable can again be passed through the hook 26. In this simple way the effective length of the cable I3 is changed.

Another important feature of the invention is its safety device for holding the bucket against accidental dumping. In Figure 1 I show a bucket 21 mounted upon a platform 28 which, in turn, is pivotally carried by the bucket carrier 6 at 29. The pivot point is slightly olf center so that the tendency of the bucket 21 will be to swing in a clockwise direction about the pivot 29. Usually where such a bucket is provided a guide rail is also used against which the bucket slides as it is moved vertically. I do away with the necessity of such a guide rail, and instead I provide a holding lever 30 which is pivoted to the carrier 6 at 3|. This lever is so weighted as to engage with the front edge of the bucket 21, and to hold it against dumping.

YIn order to prevent the lever 3U from accidentally releasing the bucket 21 I provide a locking lever 32 which is pivoted to the carrier 6 at 33. This lever 32 has a portion 34 that is designed to pass between the projections 35 carried by the lever 30, and to hold the lever 39 against accidental swinging. When the bucket is moving along the guides 2 and 3 the levers 30 and 32 will assume the positions shown in Figure l. It will be seen that the bucket 21 is held against accidental dumping, and that a guide rail for the bucket is not necessary.

In Figures 3 and 4 I show in detail how the levers 30 and 32 are actuated for freeing the bucket 21 when the bucket reaches dumping position. A cam rail 36 parallels the guide rail 2 for a predetermined distance, and is disposed in the path of the levers 39 and 32. The lower end of the cam rail 36 has a beveled portion 31 for engaging with the portions 38 and 39 of the levers 3|] and 32 respectively. Figure 3 illustrates how the locking lever 32 is swung into a position by the cam rail 36 to free the portion 34 from the projections 35. The holding lever 30 is now free to swing but its weight will still hold it in the position shown in Figure 3. Before the locking lever 32 contacts with the cam rail 35, the

forward edge 4D of the bucket 21 will have passed behind a guide plate 4I, and therefore should the holding lever 30 accidentally free the bucket the guide plate 4I will prevent its dumping.

As the bucket carrier 6 moves upwardly the portion 38 of the lever 30 will contact with the cam rail 36, and this will swing the holding lever 30 into the position shown in Figure 4. This swinging movement is timed to take place when the forward edge 49 of the bucket reaches the top of the member 4I. The portion 38 strikes the rear of the bucket during the swinging of the lever 39, and starts the bucket swinging about its pivot 29. A roller 42 is mounted at the top of the member 4I in order to aid in the dumping of the bucket.

The bucket in dumping leaves its support 9 and should the bucket be carried above the roller 42, it will again contact with the under side of the member 9 and prevent further swinging movement of the bucket. A skid rail 43 is mounted on the front of the bucket and rides over the roller 42 during the dumping movement.

When the bucket is returned to the bottom of the mine shaft it will swing back into normal position due to the roller 42. The holding lever 39 will engage with the bucket as soon as this lever clears the cam rail 36. Also the locking lever 32 will engage with the holding lever 30 as soon as the lever 32 clears the cam rail 36. The bucket is now held against dumping and can be lowered to the bottom of the mine shaft 5 for another load.

The operator, in raising the bucket, merely pulls upon the cable I3 so as to lower the counterbalance I0. The counter-balance I0 practically balances the weight of the bucket 21, and therefore one man can raise the filled bucket. After dumping has taken place the cable I3 can be again pulled upon by the operator so that the bucket carrier 6 will be lowered.

In Figure 1 I show a swingable chute. This chute comprises arms 44 pivoted to the guide rails 2 and 3 at 45. A chute 46 is carried by the arms and has a hinged portion 41 which contacts with the roller 42 regardless of the angle of the chute. A cable 48 may be secured to the rear ends of the arms 44 and the driver of the truck 49 can pull upon this cable for swinging the chute into a position to dump the material into the truck.

If desired the device may be operated by power instead of by hand. This shaft carries pulleys 5I over which the cables II and I2 are passed. It is obvious that a rotation of the shaft 50 will move the cables, and this in turn will actuate the device. If power is used the counterbalance I8 can be made heavier than the empty bucket 21, and then when a load is placed in the bucket the loaded bucket will be but slightly heavier than the counter-balance. In this way a small amount of power will be needed for moving the bucket when loaded or unloaded.

In Figures 7 to 9 inclusive I show a slightly modified form of the invention. In this form the guide rails are inclined from the vertical, and Figure 7 shows these rails entering an inclined mine shaft 15. The rails may be supported in a frame indicated generally at 11, and I have indicated a portion of this frame resting on the ground line 18.

A bucket carrier 19 slides along the rails 15, and pivotally carries a bucket 80. A counterbalance 8| is connected to the bucket carrier 19 by cables 82. The counter-balance has runners 83 that ride on the rails 15. These runners are supported by shoes 84 which have their ends turned upwardly as shown in Figure '1. These shoes slidably engage with arcuate guide rails 85 carried by the bucket carrier 19 when the counter-balance passes the bucket carrier. When the shoes 84 are on the rails 85 the runners 83 prevent lateral movement between the counterbalance 8l and the bucket carrier 19. The ends of the arcuate guides 85 extend below the upper edges of the rails 15 and cam the counter-weight 8| off from the rails 15 during the time the bucket carrier 19 passes the counter-balance. The upper edges 85 of the bucket carrier 19 are provided with inclined ends 81 which aid in lifting the counter-balance 8| oif from the guides 15. It will be seen from this construction that both the bucket carrier 19 and the counter-weight 8| have freedom of movement throughout the entire length of the rails 15.

In order to permit the bucket carrier 19 to have a portion project beyond the tops of the rails 15 I dispense with the shaft 50 and instead mount pulleys 88 corresponding to the pulleys 5I on stub shafts 89.

The bucket 8U, see Figure 9, is held in the position shown by a. holding lever 90 and a locking lever 9| similar to the levers 30 and 32, with the exception that the lever 90 and 9| are shaped to accommodate the bucket in an inclined position. The two levers 99 and 9| act in identically the same way as levers and 32 when the levers 98 and 9| pass beneath a cam guide 92 which is similar to the cam or rail 36.

All other parts of the modified form of the invention are identical to those described in the form shown in Figures l to 6 inclusive, and therefore no further description need be given.

In the operation of the device, whether the rails are vertically disposed, or are inclined, the bucket carrier and the counter-balance will have freedom of movement throughout the entire length of the guide rails. 'Ihe modified form of the device has only those additional parts added thereto which will adapt it to enter an inclined mine shaft.

While I have shown only the preferred forms of my invention, it should be understood that Various changes or modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

I claim:

1. A dump hoist comprising a frame, a bucket carrier slidably carried by the frame, a bucket pivotally supported by the carrier and being overbalanced to swing into dumping position, a holding lever mounted on the carrier and engaging with the bucket for preventing its dumping, a locking lever engaging with the holding lever for positively locking it against accidental swinging, and a cam placed in the path of said levers for first freeing the locking lever from the holding lever and then the holding lever from the bucket. for permitting the bucket to dump.

2. A dump hoist comprising a frame, a bucket carrier slidably carried by the frame, a bucket pivotally supported by the carrier and being overbalanced to swing into dumping position, a holding lever mounted on the carrier and engaging with the bucket for preventing its dumping, a locking lever engaging with the holding lever for positively locking it against accidental swinging, and a cam. placed in the path of said levers for flrst freeing the locking lever from the holding lever and then the holding lever from the bucket for permitting the bucket to dump, a bucket-retaining member positioned to receive the bucket when the two levers are released, and a roller mounted on the top of the member for guiding the bucket into dumping position.

3. A dump hoist comprising guide rails, a bucket carrier slidable along the rails, a counterbalance, cables connecting the carrier with the counter-balance, and a reel carried by the counter-balance and having the ends of the cable wrapped therearound, whereby the cables can be unwound from or wound around the reel for changing the eiective lengths of the cables, an operating cable connected between the counterbalance and the carrier, and means on the counter-balance for supporting any unused portion of the last named cable, whereby its effective length can be altered at will.

4. A dump hoist comprising inclined guide rails, a bucket carrier slidable the-realong, a counter-balance also slidable on the rails and being operatively connected to the carrier, and guide rails on the carrier for supporting the counter-balance when the counter-balance passes the carrier.

5. In a dump hoist, a bucket carrier, a bucket pivotally carried thereby, a holding lever engaging with the bucket, a locking lever for positively locking the holding lever, and means for successively moving rst the locking lever and then the holding lever for freeing the bucket.

6. In a dump hoist, an inclined bucket carrier, inclined rails slidably supporting the carrier, arcuate rails attached to the carrier, and a counter-weight connected to the carrier, said counter-weight being slidable over the inclined rails and the arcuate rails.

CHARLES MARTELOCK. 

